Rotary cutter



Nov. l1, 1941. L J NEvRAUMoN-r Re. 21,944

ROTARY CUTTER Original Filed May 15, 1936 lill/IIIA 2b 4 f3 13a 26 lsb.

INVENTOR L. J. Nevrauluou Zy ATTORNEY mwlm Ressued Nov. 11, 1941 RUTABYCUTTER -Louis J. Nevraumont, Modesto, Calif.. assignor to Bert G.Cochrane, Chicago, Ill.

Original No.

No. 19,875, May '15, 193

issue April 16 Claims.

This invention relates .to a rotary cutter, my principal object being toprovide a cutter of this character comprising stationary and rotarytoothed cutting discs mounted and cooperating in such a manner that theimplement when made in proper size will be very etlicient for shavingpurposes, as well as for hair clipping, sheep shearing, mowing andnumerous other uses. The cutter is arranged so that it isself-sharpening and it may have' a safety feature incorporated therewithto prevent possibly cutting the face or other part from which thematerial being cut projects.

iThe cutter has long wearing qualities so that the expense of bladereplacement is practically eliminated. At the same time I have mountedthe cooperating cutting discs so that either one may be easily andquickly replaced, if necessary.

Also this cutting device. because of the nature of its construction,permits cutting or shaving to occur at, or ilush with, the surface to beshaven.

A further object of the invention is to produce A a simple andinexpensive device and yet one which will be exceedingly eiective forthe purpose for which it is designed.

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawing similar characters of reference indicate correspondingparts in the several views:

Fig. 1 is a sectional elevation of one form of my improved rotary cuttermounted for shaving purposes or as a razor in connection with asupporting body and handle unit. l

Fig. 2 is a diagrammatic elevation showing a varying speed drive for therotary cutting disc.

Figs. 3 to 5 are fragmentary plan views of the cutter showing differentforms of cutting teeth.

Figs. 6 to B are fragmentary enlarged radial sections showing variousforms of safety or guard constructions. i

Referring now more particularly to the characters of reference on thedrawing. and particularly at present to the type of cutter shown inFigs. 1 to 5, the cutter comprises a stationary cutting disc I disposeddirectly above the rotary cutting disc 2. The stationary disc isprovided with opposed ears I adapted to be secured by screws 4 or thelike on top of a relatively narrow supporting body and handle member 5,with clearance under the ears for the rotary disc. This member may be ofthe same general form and size, and have cutter drive means 2,119,683,dated June 7, 1938, Serial B. Application for re- 18, 1939. Serial No.268,611

therein. as

is the case with certain standard forms of selfcontained or so-calledmechanical razors now on the market.

Between the ears the stationary disc is provided about its peripherywith notches forming teeth therebetween. 'I'hese teeth may be of variousforms, such as those having substantially parallel sides either disposedradial to the disc as shown at B in Fig. 3; at right angles to adiametral line projecting through the ears, as shown at 6a in Fig. 4; orthe teeth may be of V or saw tooth form as shown at 6b in Fig. 5. Therotary disc is provided al1 about its periphery with teeth l shaped andarranged corresponding to the teeth on the cooperating stationary disc.The cooperating discs are adapted to engage each other closely about andfor the radial extent of the teeth. being, however, relieved or concaverelative to each other inwardly of the teeth, as shown. so as to reducethe area of frictional contact.

The rotary disc is slidably and removably but non-turnably mounted onthe upper non-circular end of an axial shaft 8 depending therefrom andhaving a light compression spring 9 thereon constantly but yieldablypressing the rotary disc against the fixed stationary disc. The shaft 8may be directly driven at a constant speed by an electric motor mountedwithin the body 5. as is the case with the previously mentioned standardmechanical razor; by means of a motor driven flexible shaft, such as isused in the dental profession, or by any other suitable means, dependingof course on the type of service to which the cutter is to be put. Ihave. however, determined that for shaving purposes any speed betweenand 1600 R. P. M. may be eillciently used.

For certain classes of work, it may be found that a varying rather thana constant disc speed will give better results. The cutter shaft 8a maytherefore be gear connected to a countershaft l0, which in turn isconnected to the actual drive shaft Il by elliptic or variable speedgearing I2 of common character. With this arrangement of course therotary disc alternately slows down and speeds up at evenly recurringintervals with the constant speed of the shaft I l With this arrangementit is desirable that the rotary disc shall have a certain number ofthese slowing down and speeding up movements with each revolution.Hence. the gearing G between the shaft Ial and the counter-shaft Ill isarranged to reduce the speed of the disc considerably from that of saidshalt il.

The above form of cutter is of the plain or unguarded type and sinceopposed portions of the rotary disc on the opposite side of the body ofcourse project clear o1' the same, lt is possible for the user to cuthimseliI ii' the device is being used as a razor. This possibility may,however, be eliminated by the construction shown in Figs. 6 to 8. In theform shown in Fig. 6 the rotary disc 2 is of the same form as alreadydescribed. but the stationary disc la has a guard skirt Il dependingabout the same at right angles thereto and of course enclosing therotary disc. The stationary disc teeth are formed by closed-end slots Ilextending part way down the skirt and on top of the same for the radialextent oi' the rotary disc teeth. ln the type shown in Fig. l the skirti3d is disposed at an obtuse angle or at a iiare relative to thestationary disc Ib. I'he rotary cutter disc 2a is relatively thick: theperipheral and upper edges of the teeth in said disc engaging closelyagainst the inner suri'aoe of the stationary disc and its skirt.

In the form shown in Fig. 8 the guard skirt lab is curved and the outeredges of the teeth of the rotary disc 2b are similarly curved to engagethe inner face of the curved skirt, as shown. In the last two forms ofthe cutter the spring 9 may be omitted, since a spring pressure on therotary disc of this form would tend to cause the same to bind. In anycase, the teeth both in the rotary cutting disc and in the guard skirtmay be of the general form and arrangement as shown in Figs. 3 to 5previously described.

'I'he stationary disc, as shown in Figs. 6 to 8, is progressivelythickened from the peripheral margin toward the center, and is providedwith a central portion which is substantially thicker than the slottedmarginal portion.

The general form of cutter of any of the types herein disclosed will befound very eilcient for shaving, as well as any other purpose for whichit may be used, since the round peripheral edge of the stationary discenables the same to closely engage and follow not only flat and convexsurfaces, but get into hollows as well, and which a straight bladedimplement is apt to partially bridge and skip.

It is here to be noted that in the attached drawing, the size of thecutter as shown is approximately twice as great as it would be actuallymade if used as a razor. poses, however, the cutter would be even largerthan here shown.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially iulllls the objects of theinvention as set forth herein.

While this specication sets forth in detail the present and preferredconstruction of the device. still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claims.

Having thus described my invention, what 1 claim as new and useful anddesire to secure by Letters Patent is:

l. A cutter comprising a stationary disc, a rotary disc cooperatingtherewith, and cooperating teeth about the periphery of the discs andvarying-speed drive means connected to the rotary disc arranged toautomatically give constantly recurring relatively fast and slow periodsoi.' rotation bearing a fixed ratio to each other.

2. A cutter comprising a stationary disc, a rotary disc cooperatingtherewith, and cooperating teeth about the periphery of the discs. adrive For various other purshaft adapted to be rotated at a constantspeed, and connections between said shaft and the rotary disc to drivethe latter at varying recurring speeds witheach single revolution o!said disc.

3. A cutter comprising a stationary disc, a rotary disc cooperatingtherewith and disposed under the same, cooperating teeth about theperiphery of the discs and a guard skirt depending i'rom the stationarydisc outwardly of the rotary disc: said skirt having slots merging withthe spaces between the teeth of the stationary disc. said slotsterminating short oi' the outer edge ot the skirt.

4. A cutter comprising a stationary disc. a rotary disc cooperatingtherewith and disposed under the same, teeth about the periphery of therotary disc, said rotary disc being relatively thick and the teethextending from top to bottom thereof. a skirt depending from thestationary disc and closely engaging the edge oi' the rotary disc fromtop to bottom. and teeth about the stationary disc to cooperate with therotary disc and deilned by slots cut through the skirt and the adjacentportion of the stationary disc.

5. A device as in claim 4 in which the skirt ares outwardly from thestationary disc, the rotary disc having a complementary skirt engagingsurface.

6. A cutter comprising a stationary disc; a rotary cutter membercooperating therewith and disposed under the same; cooperating teethabout the periphery of the disc and the cutter member; and a guard skirtdepending from the stationary disc outwardly oi' the cutter member, saidskirt having slots merging with the spaces between the teeth of thestationary disc, said slots extending below said cutter member andterminating short of the outer edge of the skirt.

7. In a shaving device, the combination of a stationary apertured disc;a rotary cutter having at least one shearing edge engaging theundersuriace of said disc to sever hairs projecting through theapertures thereof; and a guard wall receding from said stationary diskand surrounding said rotary cutter, said wall having a series of slotsformed therein merging with the apertures in said stationary disc andguiding hairs thereto.

8. The invention as defined in claim 7. in which the rotary cutter has ashearing edge engaging the inside of the receding wall and co-`operating with the edges formed by the slots therein to shear oil longhairs extending through said slots.

9. The invention as defined in claim 7, in which the wall forms anobtuse angle with the disc, and in which the rotary cutter has ashearing edge engaging the inside of the receding wall and cooperatingwith the edges formed by the slots therein to shear ofi' long hairsextending through said slots.

l0. 'I'he invention as deiined in claim 7, in which the wall formssubstantially a right angle with the disc and the peripheral edge of therotary cutter is spaced inwardly oi.' the junction of the disc with saidwall.

11. A shaving device comprising a stationary disc having a series o!substantially radial narrow and closely spaced hair-receiving slotsextending therethrough at the periphery thereof; a rotary cutter memberhaving shearing surfaces cooperating with the underedges oi the slottedportion of said disc to shear off hair extending therethrough; and aguard wall receding from said disc and surrounding said rotary cutter.said wail having a series of slots merging with the slots oi the discfor guiding hair through the same and into the slots mbe edges.

12. In a shaving device having 'a rotatabie inner cutter, an outer shearplate comprising a face-engaging disc having an annular series of narrowand closely spaced hair-receiving slots therethrough: and an annularreceding guard ilange integral with the disc provided with slots mergingwith the slots in the disc.

i3. In a shaving device, the combination ci a fiat face engagingapertured shear plate; a rotatable cutter member having shearing edgesin contact with the undersurface o! said shear plate for shearing oi!hair extendins therethrough; a casing; and flange means carried by andextending outwardly from said shear plate on opposite sides thereof forsecuring the saine tosaidcasing 14. A shaving implement of the rotarytype comprising a casing: a guard member having a substantially hatcircular portion with a de-d pending peripheral wall,` said iiatcircular portion having openings forming approximately radial teeththerein, said wall having slots extending at right angles to the planeoi said teeth and merging with the openings formed in said nat circularportion; an outwardly extending ange carried by said guard member forattaching the same to saidcasing: and a cutter having a plurality orblades rotatable in contact with the inner race oi the guard.

i5. In a shaving device; the combination oi a thin, aperturedskin-contacting shear plate;

edges coopershear oil hairs projecting therethrough; a rotatable driveshaft; means for coupling said cutter member to the drive shalt forrotation therewith; a coil spring sleeving an end oi said drive shalt;and a collar lilxed to said shaft upon which said spring is seated, theopposite end of said spring engaging said cutter member and resilientlyurging the shearing edge thereof into engagement with the undersuriaceof said shear Plate.

16. A shaving device for personal use comprising a circular head havinga face and a depending peripheral flange, said head having an annularseries o! narrow and closely spaced hairreceiving slots extendingthrough the face and peripheral iiange thereof, said slots being shortin proportion to slotted portion; and a rotatable blade havingCERTIFICATE 0F CORRECTION.

e Reissue No. 21,9U4.

i Novemberrll, 191,1.

LOUIS J. NEVRAUMONT.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows:

lines '71 and 7g, claim 11, for

ond column,

uncleredgee" read the same may conform to the record (seal) --edgescooperating with the undersurfacc; the said Letters. Patent should be read with f the case in the Patent Office.

' Signed and sealed this `5rd day of March.

Page 2, s ecsurfaces cooperating with the and that this correctiontherein that A. D. 19li2.

Henry Van Arsdale tary cutter. said wail having a series of slotsmerging with the slots oi the disc for guiding hair through the same andinto the slots mbe edges.

12. In a shaving device having 'a rotatabie inner cutter, an outer shearplate comprising a face-engaging disc having an annular series of narrowand closely spaced hair-receiving slots therethrough: and an annularreceding guard ilange integral with the disc provided with slots mergingwith the slots in the disc.

i3. In a shaving device, the combination ci a fiat face engagingapertured shear plate; a rotatable cutter member having shearing edgesin contact with the undersurface o! said shear plate for shearing oi!hair extendins therethrough; a casing; and flange means carried by andextending outwardly from said shear plate on opposite sides thereof forsecuring the saine tosaidcasing 14. A shaving implement of the rotarytype comprising a casing: a guard member having a substantially hatcircular portion with a de-d pending peripheral wall,` said iiatcircular portion having openings forming approximately radial teeththerein, said wall having slots extending at right angles to the planeoi said teeth and merging with the openings formed in said nat circularportion; an outwardly extending ange carried by said guard member forattaching the same to saidcasing: and a cutter having a plurality orblades rotatable in contact with the inner race oi the guard.

i5. In a shaving device; the combination oi a thin, aperturedskin-contacting shear plate;

edges coopershear oil hairs projecting therethrough; a rotatable driveshaft; means for coupling said cutter member to the drive shalt forrotation therewith; a coil spring sleeving an end oi said drive shalt;and a collar lilxed to said shaft upon which said spring is seated, theopposite end of said spring engaging said cutter member and resilientlyurging the shearing edge thereof into engagement with the undersuriaceof said shear Plate.

16. A shaving device for personal use comprising a circular head havinga face and a depending peripheral flange, said head having an annularseries o! narrow and closely spaced hairreceiving slots extendingthrough the face and peripheral iiange thereof, said slots being shortin proportion to slotted portion; and a rotatable blade havingCERTIFICATE 0F CORRECTION.

e Reissue No. 21,9U4.

i Novemberrll, 191,1.

LOUIS J. NEVRAUMONT.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows:

lines '71 and 7g, claim 11, for

ond column,

uncleredgee" read the same may conform to the record (seal) --edgescooperating with the undersurfacc; the said Letters. Patent should be read with f the case in the Patent Office.

' Signed and sealed this `5rd day of March.

Page 2, s ecsurfaces cooperating with the and that this correctiontherein that A. D. 19li2.

Henry Van Arsdale

